Add configuration for towncrier

pyproject.toml

+[tool.towncrier]
+    package = "setuptools"
+    package_dir = "setuptools"
+    filename = "CHANGES.rst"
+    directory = "changelog.d"
+    title_format = "v{version}"
+    issue_format = "#{issue}"
+    template = "towncrier_template.rst"
+    underlines = ["-"]
+
+    [[tool.towncrier.type]]
+        directory = "deprecation"
+        name = "Deprecations"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "breaking"
+        name = "Breaking Changes"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "change"
+        name = "Changes"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "doc"
+        name = "Documentation changes"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "misc"
+        name = "Misc"
+        showcontent = true

towncrier_template.rst

+{% for section, _ in sections.items() %}
+{% set underline = underlines[0] %}{% if section %}{{section}}
+{{ underline * section|length }}
+{% endif %}
+{% if sections[section] %}
+{% for category, val in definitions.items() if category in sections[section]%}
+{% if definitions[category]['showcontent'] %}
+{% for text, values in sections[section][category].items() %}
+* {{ values|join(', ') }}: {{ text }}
+{% endfor %}
+
+{% else %}
+*  {{ sections[section][category]['']|join(', ') }}
+
+{% endif %}
+{% if sections[section][category]|length == 0 %}
+No significant changes.
+{% else %}
+{% endif %}
+{% endfor %}
+
+{% else %}
+No significant changes.
+
+
+{% endif %}
+{% endfor %}